If he still chooses to go hiking alone, here are some tips:
1. Have at least a belt sized survival kit. There are several that you can purchase or buy items and stock your own.
2. Know where you are going, and leave an itinerary with someone who will know if you are missing. One of the keys to search and rescue is to know where to start looking!
3. Be PREPARED! I don't know how many S&R calls I get from people that started out in a tank top, shorts, and flip flops with little to no water, get lost, then they have to be bailed out. Take extra water, map, compasss, (know how to use them...), clothing not only for current but expected weather, etc.
I occasionally hike alone with my dog but follow my own advice!